The Retainer,optical Element, cataloged under National Stock Number 1240-01-129-0936, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-129-0936 |
| Primary Part Number | 12309701 |
| Item Name | Retainer,optical Element |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flange Diameter | 1.7500 INCHES NOMINAL IN |
| Tapered Hole Minor Diameter | 1.4780 INCHES NOMINAL IN |
| Shoulder Length | 0.1250 INCHES NOMINAL IN |
| Shoulder Diameter | 1.6250 INCHES NOMINAL IN |
| Style Designator | SHOULDERED |
| Setscrew Notch | NOT PROVIDED |
| Taper Angle in Deg | 15.0 |
| Guide Location | BOTH EDGES |
| Guide Design | THREAD CHAMFER |
| Internal Annular Serration | NOT PROVIDED |
| Material | ALUMINUM ALLOY 2011 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12309701 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 1240-01-129-0936 is a Retainer,optical Element, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-129-0936 has 1 manufacturer part number on file: 12309701 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 2920-01-238-9710. Verify interchangeability with system specifications before substitution.
Key specifications for 12309701: Flange Diameter: 1.7500 INCHES NOMINAL IN; Tapered Hole Minor Diameter: 1.4780 INCHES NOMINAL IN; Shoulder Length: 0.1250 INCHES NOMINAL IN; Shoulder Diameter: 1.6250 INCHES NOMINAL IN. 11 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1240-01-129-0936 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.